Feeder for threading machines



Jan. 19, 1932. GALE 1,841,800

FEEDER FOR THREADING MACHINES Filed Oct. 16, 1929 3 Sheets-Sheet 1 Jan. 19, 1932. M GALE 1,841,800

FEEDER FOR THREADING MACHINES Filed Oct. 16, 1929 3 Sheets-Sheet 2 8 140044 to 1 E0 M/flRaMbRGFI/V GHLE.

Jan. 19, 1932 E. E 1,841,800

FEEDER FOR THREADING MACHINES Filed Oct. 16, 1929 5 Sheets-Sheet 3 after 14mg;

Patented Jan. 19, 1932 EDWARD monean GALE; on FAIBFIELD,ALA.BAMA

FEEDER FOB THREADING MACEIN ES Application filed October 16, 1929. Serial No. 400,070.

This invention relates to bolt threading machines of the roll threading type, and more particularly to an attachment for feeding one bolt-blank'at a time between the dies of such a machine.

In operating a roll threading machine without a feeder the operator is required to put the bolt-blank into exact position and frequently. happens that a stroke of the mam chine is lost by reason of the fact that it takes very careful mani ulation and a certaln extended period of time for the operator to ac-v com lish his purpose so that when he misses getting a bolt-blank in proper position between thedies the stroke of the machine is lost and therefore wasted.

The object of the invention is to provide a feeder which can be attached with little diflicultyto any roll threading machine of usual 0 design in order to make certain that a bolt is threaded at every stroke of the machine and thus increase the output of the machine.

With the feeder attached the placing of the. bolt-blank into exact position with reference to the dies of the machine is automatic and is accomplished definitely and at the proper time by the machine itself and the operator can easily keep bolt-blanks in the feeder, since the bolt-blanks do not have to be placed so carefully in the feeder itself as in the machine without a feeder.

The drawings herewith are illustrative and show the relation of a feeder to abolt threading machine of the roll-threading type, and they also show the relation of the several parts of the feeder to each other.

In the drawings Fig. 1 is a side elevation of a feeder and ortion of a roll-threedin machine to which it is attached showing t e position of the parts at the beginning of a stroke of the machine;

Fig. 2 isa sectional elevation on line 22 of Fig. 1;

Fig. 3 is a side elevation of the feeder and a portion of the roll-threading machine to which it is attached showing the position of the parts at the end of a stroke of the machine;

views of certain portions of feeder shown in Figs. 1, 2 and 3. Referring in detail to the drawings, A is a fixed die held in die holder B which is fastened to frame C of machine and D is a reciprocating die held in a reciprocating die holder E which is driven back and forth in slides on frame C by pitman F, which in turn is driven by parts of the machine not shown.

An adjustable stop G is arranged to engage a lever trigger which operates the 55 feeder. H indicates bolts that fasten the feeder to the machine. A plate 1, working between dies, is used to determine the length i of thread on the bolt. This plate has a shorter travel but a relative motion to the 7 moving die and reciprocates in slides and is driven by parts of the machine. The slides and driving parts are not shown as they are usual and' do not constitute any part of this invention. This plate has a stepped portion as shown, the horizont l edge 5 of the stepped portion serving as a sii p ort for the bolt-blank before it enters the dies,

and the vertical edge of the stepped portion serving as a pusher and to compel bolt-blank to take a vertical position as it enters thedies.

A chute J serves to guide threaded bolts into a receptacle not shown.

The'feeder, as shown, includes a frame 10 which supports a chute 12 from which bolt- 5 blanks slide and fall into a funnel shaped guide-cup 14 which locates the bolt-blanks in the dies of the machine. A bolt-blank ate 16 pivoted on a support on frame 10 is roc ed once during each stroke of the machine to' co allow one bolt-blank at a time to slide down the chute 12. The bolt-blank gate 16 is operated by means of the bell crank lever trigger 18 which contacts with adjustable stop G once durin each stroke of the machine, and is moved 1; ereby from full line position to dotted line position shown on Fig. 1, and as indicated in Fig. 3. A spring 20 fastened to p s ring anchorage 22 and to gate 16 maintains t e gate 16 in normally closed position. ace

anchorage 22 is fastened to frame 10 as shown.

A spring 24 fastened to spring anchorage 26 and to trigger 18 maintains trigger 18 in normal position against stop 28. The spring anchorage 26 and stop 28 are fastened to frame 10. An adjustable screw 30 is mounted on trigger 18 and governs the movement 0 the gate 16.

Slotted plates 32 welded to chute 12 and slotted supports 34 fastened hingedly to guide-cup 14 and by clamp bolts 36 to plates 32 provide an adjustable support for guidecup 14.

A lug 38 on the chute 12, a lug 40 on frame 10, a bolt 42 and a collar 44 fastened to bolt 42 provide for adjusting the chute 12 relatively to the frame 10. Clamps 46 held by bolts 48 fasten chute 12 to frame 10.

Details of the guide-cup 14 and its supporting means are illustrated in Figures 5, 6, 7 and 8. Referring to these figures, a hinged door 50 held normally closed by a spring 52 forms a portion of the wall of ide-cup 14. The guide-cup 14 as a unit is astened hingedly to slotted supports 34by screws 54.

' Flat springs 56 fastened to supports 34 by screws 58 retain steel balls 60 in holes that are in supports 34, the balls being larger in diameter than the thickness of supports 34 project inwardly towards cup 14 and engage spherical recesses in the cu 14, forming a somewhat rigid but yielda le spring latch. The

holes for balls 60 are reduced in diameter next to cup 14 so that the balls will not fall out when cup 14 is free from engagement with said latch. This arrangement provides a yieldable pivoted support for the guide-cup 14, which will normally hold it in the substantially vertical position shown in Figs. 1 and 3. However, should any unusual or abnormal pressure be supplied the cup will be permitted to swing on itspivot and thereby prevent damage to the feeder.

Such an abnormal or unlooked for performance might happen on rare occasions by the jamming of an oversized bolt-blank or due to failure of parts of the bolt threading P machine or the presence of foreign objects thereon.

The feeder is attached to the machine and the parts thereof are so adjusted that the slide will deliver a bolt-blank into the guidecup substantially axially of the hole in bottom of cup and the cup is adjusted exactly over the location between dies where it is desired to locate a bolt-blank relative to the dies at the beginning of the stroke of the machine.

Fig. 1 shows the osition of dies and parts of the machine at 81c beginning of a stroke and bolt-blank BB has just dropped into position. The machine then makes half a stroke bringing the dies to position indicated in Fig. 3 when threaded bolt B drops out from between the dies and falls through chute J into receptacle not shown. Near t e end of the half-stroke, the stop G strikes trigger 18 bringing it to position shown in dotted lines in Fig. 1 and full lines in Fig. 3. The result of this contact is to raise boltf blank gate 16 and release bolt-blank BB which slides down chute 12 into cup 14 to the position indicated at BB and so on for boltblanks BB BB, etc. It is to be noted that the door 50 is held by spring 52 while the cup 14 is guiding the bolt-blank into position, but the spring 52 is a comparatively weak one and the force exerted by the movement of bolt-blank along the dies opens the door into position shown in Fig. 8 to allow bolt-blank to blank slides past the door 50 as it opens and as soon as it clears the door, the spring 52 pass out of the guide-cup 14. The boltcloses the latter and the cup 14 is ready to re- 5 ceive and guide another bolt-blank into position.

The bolt-blank is preferably in position indicated at BB in Fig. 1 before the beginning of a stroke and an ideal adjustment of sto G is to have it contact with trigger 18 at sue a time that the sliding of a bolt-blank down the chute and into position shown at BB in Fig. 1 will take the same time as the return half stroke of the machine takes in order to have bolt-blank arrive at osition BB in Fig. 1 exactly at the moment tlie machine begins a new stroke. If, however, the bolt-blank is delivered into cup before the machine has completed the return half stroke it will rest on top edge of plate I in position BB on Fig. 3 and plate I slides out from under the boltblank'dropping it into position BB on Fig. 1 just before ending a stroke and before a new stroke is commenced. I

While one specific embodiment of the invention has been shown and described, it will be understood that the invention is not limited thereto, since various modifications may be made without departing from the scope of the invention as defined in the apnded claims.

What I claim is:

1. A'feeder of the character described com.- prising a guide chute, a positioning means arranged in alignment therewith, apivoted member adapted to work blanks from the guide chute to said positioning means, a trigger for actuating said member, and a reciprocating die holder carrying a stop adapted to move said trigger.

2. A feeder of thecharacter described comprising a guide chute, a positioning means arranged in alignment therewith, a pivoted member controllin the passage of work blanks from the guide chute to said positioning means and a bell crank tri ger, an adjustable element carried by said bell crank be oscillated to release trigger, said element being adapted to coact with said pivoted member.

3. A feeder of the class described including means for holding a plurality of work blanks in longitudinal alignment, a cup-like positioning member adapted to receive work blanks from said means, and a yieldingly pivoted door constituting part of the side wall of said member adapted to yield laterally to release the work.

4. A feeder of the-class described including means for holding a plurality of work blanks in longitudinal alignment, a cup-like positioning member adapted to receive work blanks from said means, means for pivotally supporting said member and an impositive look normally holding said member in its operative position and adapted to permit it to yield to prevent drainage upon failure of proper operation of the apparatus.

5. A feeder of the class described including an inclined chute of angular cross section for holding a plurality of work blanks in longitudinal alignment, a cup-like positioning member adapted to receive work blanks from said chute, means for adjustably supporting the latter, and adjustable supporting means for said cup-like member carried by said chute.

6. A feeder of the class described including means for holding a plurality ofwork blanks in longitudinal alignment, at cup-like positioning member adapted to receive work blanks from said holding means and an impositive lock for holding said positioning member whereby it may be moved from its normal position upon the application of abnormal pressure thereto so as to prevent damage to the feeder.

7. A feeder including means adapted to hold a plurality of blanks in longitudinal alignment, a cup-like positioning member adapted to receive work blanks from said means, and a pivoted door constituting part of the side wall of said member and adapted to open outwardly to release the work therefrom and means normally tending to impositively hold said pivoted member in closed position.

In witness whereof, I have hereunto signed my name.

EDWARD MORGAN GALE. 

